Projecting from UTM results in stairstep pattern

Anonymous User — Tue, 06 Mar 2012 16:49:24 GMT

Original User: rs60

I have a high resolution RapidEye image that was delivered in UTM 10, WGS84. When I reproject this image, the resulting output has a systematic stairstep pattern in it that seems too uniform. Every 31 to 32 pixels in both the north/south and east/west direction, there is a shift of 1-2 pixels. It really stands out in the roads and other linear features found throughout the image. I am getting the same result when I reproject any UTM image to another projection and/or datum, although the length of the stairsteps varies depending on the output projection. But if my input imagery is in a different projection, say Geographic, I am not seeing this systematic shift in the output; the linear features have a more normal, irregular nearest-neighbor blockiness.

I've attached a .jpg of an output image. Again, the absolute uniformity of the stairsteps throughout the output image is what raises questions with me.

Is this just a function of reprojecting from UTM and is "normal"? Or is there a problem with the transformation?

I would really appreciate any insight that could be provided.

Thanks,
rs

Re: Projecting from UTM results in stairstep pattern

Anonymous User — Wed, 07 Mar 2012 08:01:20 GMT

Original User: dasmy004

Hi rs,

check the re sampling method.
it is most likely that you are using nearest neighbor.
try using Bilinear or cubic convolotion

Regards,
Mohammad

topic Re: Projecting from UTM results in stairstep pattern in Data Management Questions

Projecting from UTM results in stairstep pattern

Re: Projecting from UTM results in stairstep pattern